Serial RapidIO (SRIO) User's Guide

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5.71 Port Local AckID Status CSR n (SP n_ACKID_STAT)
SRIO Registers
Each of the four ports is supported by a register of this type (see Table 144 ). The port local ackID status
CSR n (SP n_ACKID_STAT) is shown in Figure 134 and described in Table 145 .
Table 144. SP n_ACKID_STAT Registers and the Associated Ports
Register Address Offset Associated Port
SP0_ACKID_STAT 1148h Port 0
SP1_ACKID_STAT 1168h Port 1
SP2_ACKID_STAT 1188h Port 2
SP3_ACKID_STAT 11A8h Port 3
Figure 134. Port Local AckID Status CSR n (SP n_ACKID_STAT)
31 29 28 24 23 16
Reserved INBOUND_ACKID Reserved
R-0 R/W-0 R-0
15 13 12 8 7 3 4 0
Reserved OUTSTANDING_ACKID Reserved OUTBOUND_ACKID
R-0 R/W-0 R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; - n = Value after reset
Table 145. Port Local AckID Status CSR n (SP n_ACKID_STAT) Field Descriptions
Bit Field Value Description
31–29 Reserved 0 These read-only bits return 0s when read.
28–24 INBOUND_ACKID 00000b–11111b Input port next expected ackID value
23–13 Reserved 0 These read-only bits return 0s when read.
12–8 OUTSTANDING_ACKID 00000b–11111b Output port unacknowledged ackID status. Next expected acknowledge
control symbol ackID field that indicates the ackID value expected in the
next received acknowledge control symbol.
7–5 Reserved 0 These read-only bits return 0s when read.
4–0 OUTBOUND_ACKID 00000b–11111b Output port next transmitted ackID value. Software writing this value can
force retransmission of outstanding unacknowledged packets in order to
manually implement error recovery.
Serial RapidIO (SRIO)202 SPRUE13A – September 2006
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